proxmark3/tools/mfkey/mfkey64.c

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#define __STDC_FORMAT_MACROS
#include <inttypes.h>
#define llx PRIx64
#define lli PRIi64
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// Test-file: test2.c
#include "crapto1.h"
#include <stdio.h>
int main (int argc, char *argv[]) {
struct Crypto1State *revstate;
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uint64_t key; // recovered key
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uint32_t uid; // serial number
uint32_t nt; // tag challenge
uint32_t nr_enc; // encrypted reader challenge
uint32_t ar_enc; // encrypted reader response
uint32_t at_enc; // encrypted tag response
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uint32_t ks2; // keystream used to encrypt reader response
uint32_t ks3; // keystream used to encrypt tag response
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printf("MIFARE Classic key recovery - based 64 bits of keystream\n");
printf("Recover key from only one complete authentication!\n\n");
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if (argc < 6) {
printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}>\n\n",argv[0]);
return 1;
}
sscanf(argv[1],"%x",&uid);
sscanf(argv[2],"%x",&nt);
sscanf(argv[3],"%x",&nr_enc);
sscanf(argv[4],"%x",&ar_enc);
sscanf(argv[5],"%x",&at_enc);
printf("Recovering key for:\n");
printf(" uid: %08x\n",uid);
printf(" nt: %08x\n",nt);
printf(" {nr}: %08x\n",nr_enc);
printf(" {ar}: %08x\n",ar_enc);
printf(" {at}: %08x\n",at_enc);
/*
uint32_t uid = 0x9c599b32;
uint32_t tag_challenge = 0x82a4166c;
uint32_t nr_enc = 0xa1e458ce;
uint32_t reader_response = 0x6eea41e0;
uint32_t tag_response = 0x5cadf439;
*/
// Generate lfsr succesors of the tag challenge
printf("\nLFSR succesors of the tag challenge:\n");
printf(" nt': %08x\n",prng_successor(nt, 64));
printf(" nt'': %08x\n",prng_successor(nt, 96));
// Extract the keystream from the messages
printf("\nKeystream used to generate {ar} and {at}:\n");
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ks2 = ar_enc ^ prng_successor(nt, 64);
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ks3 = at_enc ^ prng_successor(nt, 96);
printf(" ks2: %08x\n",ks2);
printf(" ks3: %08x\n",ks3);
revstate = lfsr_recovery64(ks2, ks3);
lfsr_rollback_word(revstate, 0, 0);
lfsr_rollback_word(revstate, 0, 0);
lfsr_rollback_word(revstate, nr_enc, 1);
lfsr_rollback_word(revstate, uid ^ nt, 0);
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crypto1_get_lfsr(revstate, &key);
printf("\nFound Key: [%012"llx"]\n\n",key);
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crypto1_destroy(revstate);
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return 0;
}